Humidifier



FIG. 1 is a front perspective view of a humidifier showing our design;

FIG. 2 is a left side perspective view of the humidifier described in FIG. 1; and,

FIG. 3 is a top plan view of the humidifier described in FIG. 1.

The bottom and rear of the design are flat and unornamented. 

The ornamental design for a humidifier, as shown and described. 